AUTOSWITCHER
is a twilight controller. Any twilight controller has a photosensitive
device which senses the change in ambient light level (ALL) in Lux. At
sunset, when ALL is low, it gives a command to switch on the lights and
after sunrise to switch off.

AUTOSWITCHER,
though basically a twilight controller has many more interesting and
useful features to make it unique in several ways.

It has time delay facility to switch on and off the load. When ALL is
low, it does not switch on the lights instantly but takes 3 to 7 minutes
to do so. The same delay is provided for switching off, too. This helps
in avoiding erratic working of switching at the time off temporary
darkness in cloudy weather, lightening or flashes of lights etc..
It is observed that at some places/streets, traffic is negligible after
midnight ( or, for advertisements, neon displays are not required after
midnight). For such requirements, we have type 200x series in which
provision is made to automatically switch off one phase or two phases
after a desired time (normally 3 to 7 hours typically). This will save
precious electricity everyday. In some versions, MCBs of rated capacity
are provided for each phase independently.
All models come with independent photo sensor assembly in a
weather-proof, dust protected ABS moulding which is to be installed outside to sense
ALL. It is electrically isolated from the mains with absolutely no shock
hazards.

Once the ALL setting is done( normally it is factory-set for 6
to 10 Lux), it will regularly switch on and off the lights
exactly as desired ,not a few Lux more or less. Hence, once
installed, no recalibration is needed for its entire life.

It is not worried about the time of day for its operation but
exclusively the ALL, twilight level. Nor does it have any moving
part. Hence, practically, it is maintenance free in operation.

It does not need any battery to count the delay time. Lapsed
time is counted and stored in electrostatic devices which are
non-volatile in nature for a few hours. Even if supply fails,
off-delay counting will start from where it has stopped and not
from zero.

TIMER
TYPES

On
and Off times are to be set for control. Due to seasonal
changes, sunrise and sunset times are changed. Setting is to be
carried out regularly to track these changes.

Electromechanical clock is required which is a continuously
moving part. Being so, it may run slow or fast resulting in
erratic switching. Maintenance is required.

In electronic times, off delay facility is provided with the
help of built-in battery. Without the battery, timer is reset to
zero every time mains fails. Maintenance of battery is another
problem.

This is the compact
control module to replace electromechanical time-switch or
microporocessor controlled one. It has function switch, TWILIGHT
SET control and 3 LEDs to indicate the operation. It has built-in time
delay of 5 min for switching on and off the load. Its output is
potential-free contact of 5A/250VAC (2A/415VAC). Hence, contactor with
coil voltage of 230VAC or 415VAC can be driven by this module.

TWILIGHT set
control
: Adjustable with screw driver to precisely set the twilight level at
which to switch on and off the load. It is factory set for 16 Lux level
which is best suited for street lights control.

INDICATIONS:

MAINS: Red LED to
indicate mains is connected to the unit. When FUNCTION switch is in OFF
position, this will be off.

TWILIGHT: Green LED to
indicate that the desired darkness has set in. Count down of 5 Min will
start and load will be on after this delay. Similarly, in the morning
this LED will be off when desired light level is reached and load will
be off after the delay.

It is the best and
fool-proof design in higher current range, best suited for the control
of street lights in big cities. It has two independently
controlled power relays, "Normal" capable of switching two
phases simultaneously and "Aux" capable of switching third
phase. Two phases will be on throughout the night and third phase
will be automatically shut off after desired time, if needed. An
independent MCB of rated capacity is provided inside the box for each
phase. Thus only the affected phase will be shut off in the event of
overload or short circuit in a particular phase keeping supply to other
phase undisturbed. It works on single phase for its operation. This unit
is useful when a certain phase is to be switched off after say,
midnight, keeping only two phases on thereby saving the electricity.

TECHNICAL
SPECIFICATIONS:

Mains for operation:
230V/50Hz

Load: 3 Phase

Switching Devices: Power
Relays, 2 Nos., 30A

Control Action: At dusk,
both relays are on. "Aux" relay will be off after the set time
delay adjustable between 3 hours and full night. One phase will be off
after this set time while two other phases connected to
"Normal" will be on throughout the night.

1.Twilight controller, AUTOSWITCHER AS2K1 is a single unit used to control
two independent circuits, one for dusk to dawn operation and the other
for dusk to midnight hours adjustable as desired.

2.The unit works in wide
mains fluctuations from 160V to 400V, AC, single phase.

3.
Extra Safety Feature is provided built-in to safeguard the entire unit
as well as connected load form dangerously high voltages upto 400VAC
on normal mains line of 230V. The unit withstands this dangerous
voltage for indefinite time while it immediately disconnects the
connected load. Load is reconnected when supply resumes in the
normal range. Load can be set to disconnect at any voltage level from
250 to 300 VAC. By default, it is kept at 270V

4.The unit comes
complete with the sensor supplied with 5 meter length of wire to make connection to the main unit. Sensor is electrically
isolated from the mains supply; hence, there is absolutely no chance of shock hazards.
5.Two outputs are called NML OUTPUT and AUX OUTPUT meaning
respectively
dusk-to-dawn output and midnight hours output.

6.
Both the outputs are
available in potential-free contacts in pairs; 2 pairs of NO contacts are
available for both the outputs by means of two independent relays with the
current capacity of 5A / 230VAC.

7.
Individual fuses for outputs as well as for main unit.
8.Delay time of 5 min (typical) is provided for both ON and OFF actions of the
relays to avoid false triggering during momentary lightening or sudden flash
of lights,
9.Counting of the time for midnight operation is done by electronic storage
devices and they are designed to have memory even without mains power.
10.No batteries are required for the storage of elapsed time data. During night, if mains supply fails for
some time, it will not reset to zero but stores the time elapsed. When mains
supply resumes, it will start from the moment it had reached when supply failed.
This is the beauty of this unique circuitry that it totally eliminates the use of
battery for retention of memory.

11.
Twilight zone can be set between 0 to 40 Lux.

NEEDSNO BATTERY FOR MEMORY, NO
RESETTING WITH SEASONAL CHANGES.

SAVES
ENERGY BY PARTIAL LOAD SHUT DOWN AT MIDNIGHT HOURS

PROTECTS
AGAINST ABNORMAL VOLTAGE OF UPTO 400VAC

BASIC OPERATION

AUTOSWITCHER AS2001A, works on the principle of detecting the
ambient light level (ALL) by means of light sensor and giving the command to control
the potential free contacts to operate accordingly. The twilight zone at which this
should happen is adjustable and accessible to the operator to set anywhere between
0 and 40 Lux by means of a simple preset. Once set as per desired level, there
is no necessity of adjusting it in its life time as the seasonal changes in Sunset
and Sunrise are automatically taken care of by the sensor. This is the biggest advantage
of the product over any real-time switch where, with the changes in these timings, it needs
recalibration during different seasons. It is not the time of the day that is sensed by
AUTOSWITCHER but it is actual ALL that is sensed. Secondly, no batteries are needed as the
storage of the time elapsed is done by electronic circuitry only.

The unit uses a single light-sensor housed in weather-proof moulding with the long-horn
design such that no direct light is possible to fall on it.

The unit has two independent outputs, NML and AUX, for dusk to dawn and midnight
hours operations. Two pairs of potential free contacts for both the outputs are provided
as an added security; in the event a pair of contact breaks down for any reason, stand-by
pair is available for use.

The unit has following controls accessible by the operator.

1. SET-TWILIGHT: On-board control accessible from the outside to adjust the desired
Lux level for twilight zone, right from 0 to 40 Lux. Once, set as per your needs, it should
never be disturbed during its entire life time.

2.ON-OFF-AUTO: Three way switch to have the load manually ON or OFF and AUTOmatically
operated. Manual ON and OFF positions are provided for routine maintenance of
connected load.

3.OFF-DELAY SET: Not to be confused with on/off delay of 5 min provided built-in by the
circuitry. This is the time to be set for midnight hours of operation on AUX output. This
can be set from a few minutes to overnight. If the control is kept at fully anticlockwise
position, it will switch off the load in a few minutes after dusk. If it is kept fully clockwise,
the lights connected to AUX terminals will be on throughout the night as in the case of
NML output. The range of this time is, by default, kept between 3
hours and 10 hours.

The unit has the following indications.

1. MAINS ON: By LED to indicate the unit is connected to mains and supply is available.

2. TWILIGHT: By LED to indicate that set lux level of twilight zone has reached. This indication
is useful to adjust the desired twilight level by means of SET-TWILIGHT control. When this
LED turns on it also indicates that both the relays (NML and AUX) will be on within 5 min.
In the morning, when this LED turns off, it indicates that the NML contacts will be off after
5 min (AUX contacts must have been off in the midnight itself as per OFF-DELAY-SET)

3. NML LD: This LED indicates the state of load connected to NML output.

4. AUX LD: This LED indicates the state of load connected to AUX output. At dusk, both the
LEDs, NML LD and AUX LD will be on simultaneously. AUX LD will be off at midnight hours
as per setting done by operator.

NOTE ON BATTERY LESS OPERATION:

Normally a battery is required to have the memory of elapsed time. In our circuit, this
has been done electronically by sample and hold circuitry. This circuit hold the data even
if mains supply fails for hours in the night. During daytime, the data is positively cleared
to have fresh timing cycles to start at dusk. The circuit needs the data
only for a night as it is going to be refreshed every day. The designed sample--and-hold
circuitry has the capacity to hold the data for well over 20 hours and hence no need of
battery.

Do you want your
existing lighting fixture to operate automatically without any external
control gear? This is the most economical way to do it. Just
insert this all-weather proof metallic controller inside any lighting
fixture and it will have automatic on/off control at dusk and dawn! With
just three wires!

Fully
Automatic.Ecological – It Saves
Electricity.Absolutely Maintenance Free.No Batteries Required.No Moving Parts.Extremely Economical – Pays for
itself in less than 1 year.Entire Assembly can be directly
mountedin open air.Fully weather proof.Automatically tracks local Sunset
andSunrise times as per the seasonal
changes.Complete Unconditional WarrantyCan be
fitted in the housing of any lighting fixture for automatic control.
Salient Features:
Rugged, water-proof, weather-resistant, metallic housing (Copper body,
chrome plated) for directly mounting in open air.
Operates on 230V/50 Hz and controls any mains operated load upto 500W
Only three wires for connection. Black (Neutral), Red (Live In) and
Grey (Live Out)
Sensor is integrated to the metallic housing and made
weather-resistant.

General
Information:

The TC-5 is an exceptional twilight control device. It comes complete
with a smart photosensitive unit that acutely senses the changes in the
Ambient Light Level (ALL). At sunset the TC-5 photosensitive unit
automatically detects the low ALL and sends a command to activate your
desired lighting. The same holds true at sunrise when the TC-5 detects
the rise in ALL and commands the appropriate lighting to be switched
off.

The TC-5 does not stop there!

The TC-5 comes with a uniquely developed time delay facility for
switching the load on and off. In this respect the TC-5 is capable of
thinking for itself, while it passes the savings on to you. For example,
when the ALL becomes suddenly low, the TC-5 does not instantly activate
the lights, but instead waits for 3-7 minutes before issuing the
command.

This unique time delay feature also works when there are sporadic
increases in ALL..

This cost-saving attribute prohibits the lights from being turned on
unnecessarily in instances of temporary darkness, such as cloudy or
stormy weather, or being turned off by lightning of haphazard flashes of
flight.